Improper Input Validation Affecting mediawiki package, versions <1:1.15.5-5


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
1.92% (78th percentile)

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  • Snyk IDSNYK-DEBIAN14-MEDIAWIKI-11760552
  • published10 Aug 2025
  • disclosed27 Apr 2011

Introduced: 27 Apr 2011

CVE-2011-1579  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Debian:14 mediawiki to version 1:1.15.5-5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mediawiki package and not the mediawiki package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

The checkCss function in includes/Sanitizer.php in the wikitext parser in MediaWiki before 1.16.3 does not properly validate Cascading Style Sheets (CSS) token sequences, which allows remote attackers to conduct cross-site scripting (XSS) attacks or obtain sensitive information by using the \2f\2a and \2a\2f hex strings to surround CSS comments.

CVSS Base Scores

version 3.1